diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2017-02-09 05:58:20 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-02-15 12:02:40 +0300 |
| commit | f4894b80b1ddfef00d4d2e5c58613ccef358a1b2 (patch) | |
| tree | 2e9fd26b7f3af5fe021b8d4e21bbc58c40d10540 /arch/powerpc/include/asm/book3s/64/pgtable.h | |
| parent | ca94573b9c69d224e50e1084a2776772f4ea030d (diff) | |
| download | linux-f4894b80b1ddfef00d4d2e5c58613ccef358a1b2.tar.xz | |
powerpc/mm/radix: Use ptep_get_and_clear_full when clearing pte for full mm
This helps us to do some optimization for application exit case, where we can
skip the DD1 style pte update sequence.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Tested-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/book3s/64/pgtable.h')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/pgtable.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 5905f0ff57d1..fef738229a68 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -371,6 +371,23 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, return __pte(old); } +#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL +static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, + unsigned long addr, + pte_t *ptep, int full) +{ + if (full && radix_enabled()) { + /* + * Let's skip the DD1 style pte update here. We know that + * this is a full mm pte clear and hence can be sure there is + * no parallel set_pte. + */ + return radix__ptep_get_and_clear_full(mm, addr, ptep, full); + } + return ptep_get_and_clear(mm, addr, ptep); +} + + static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t * ptep) { |